[#52] object/range: Attach received object header to result

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/services/object/range/res.go

@@ -1,5 +1,15 @@
 package rangesvc
 
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/core/object"
+)
+
+type Result struct {
+	head *object.Object
+
+	stream Streamer
+}
+
 type Response struct {
 	chunk []byte
 }
@@ -7,3 +17,11 @@ type Response struct {
 func (r *Response) PayloadChunk() []byte {
 	return r.chunk
 }
+
+func (r *Result) Head() *object.Object {
+	return r.head
+}
+
+func (r *Result) Stream() Streamer {
+	return r.stream
+}